ViewSonic P774B-2NT Series Service Manual Download Page 39 | Manualshive

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38

10. IC BLOCK DIAGRAM

IC401 STV9118

IC101 NT6865

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Summary of Contents for P774B-2NT Series

Page 1: ...EPAIR SERVICE INFORMATION ONLY EVERY REASONABLE EFFORT HAS BEEN MADE TO ENSURE THE ACCURACY OF THIS MANUAL WE CANNOT GUARANTEE THE ACCURACY OF THIS INFORMATION AFTER THE DATE OF PUBLICATION AND DISCLA...

Page 2: ...MICRO CONTROLLER CIRCUIT 11 5 2 DEFLECTION CIRCUIT 11 5 3 TRANSISTOR DIODE CIRCUIT 12 6 TROUBLE SHOOTING CHART 13 6 1 NO RASTER CRT RELATIVE CIRCUIT PROBLEMS 13 6 2 ABNORMAL DISPLAY 15 6 3 NO BLANKIN...

Page 3: ...deo Signal Factory Preset 1 2 3 4 Resolution 720 400 640 480 640 480 800 600 H KHz 31 327 31 469 43 3 53 674 V Hz 69 616 59 943 85 00 85 061 Factory Preset 5 6 7 Resolution 1024 768 1152 864 1280 1024...

Page 4: ...C class B part 15 Test procedures Standards Requirements frequency range Remarks Conducted power line emission EN 55022 Class B FCC Part 15 Subq B 150 kHz 30 MHz 450 kHz 30 MHz Radiation emission EN55...

Page 5: ...n AC leakage current check on the exposed metallic parts of the cabinet such as screw heads Test method for current leakage is described as follow a Plug the AC line cord directly into rated AC outlet...

Page 6: ...for the chassis type The maximum operating HV specified for the chassis used in this monitor is 25 0KV 1KV with a line voltage of 120 240 VAC Higher voltage may also increase possibility of failure i...

Page 7: ...he connector to ensure firm grounding The connector information is as follow 15 Pin Color Display Signal Cable PIN NO DESCRIPTION PIN NO DESCRIPTION 1 RED 9 5V From PC 2 GREEN 10 Sync GND 3 BLUE 11 NC...

Page 8: ...03 RECALL PCB MAIN SW103 4 3 ADJUSTMENT METHOD 4 3 1 14V B HV voltage adjustment A Chroma 2000 Signal generator or PC equivalent set mode 1 VGA 640X480 pattern 1 0 B Connect a DC Volt meter between TP...

Page 9: ...set Top corner V LINEARITY Bottom corner FM Frequency select 93 9300 COLOR TEMPERATURE KY Select four key or five key 65 6500 COLOR TEMPERATURE HP H SIZE PHASE OH OSD H CENTER OV OSD V CENTER BI SET B...

Page 10: ...11 Y 200 then save it into 9300K color temperature set R or G or B gain make x 313 y 329 Y 180 then save it into 6500K color temperature in the end exit the factory setting area G Choose 1 for LH set...

Page 11: ...etween them constant E Produce a white crosshatch pattern on the display F Vertical green and magenta lines are converged by varying the angle between the two tabs of the 6 pole magnets G Horizontal g...

Page 12: ...or the monitor testing use 5 2 DEFLECTION CIRCUIT The deflection circuit is achieved by a high performance and efficient solution IC 401 STV 9118 for this monitor The concept is fully DC controllable...

Page 13: ...4 Bridge Rectifier for AC Source D910 Clamp Diode for Snubber CKT D918 D919 Rectifier for Output Voltage D922 Rectifier for Output Voltage D923 Rectifier for Output Voltage D925 Rectifier for B Supply...

Page 14: ...OLTAGE OF CRT HEATER ABOUT 6 3V CHECK VOLTAGE OF THE CRT CHECK BRIGHTNESS CIRCUIT OK CHECK POWER SAVING CIRCUIT H SYNC V SYNC SIGNAL Q909 Q910 ABNORMAL DISPLAY CHECK SCREEN VOLTAGE ABOUT LESS THAN 300...

Page 15: ...p CONTRAST SET MAX R G B APPROACH STANDARD CHECK SIGNAL CABLE OR INTERFACE CARD PIN 10 18 ABOUT 5V CHECK 5V RELATIVE CIRCUIT CHECK THE IC801 PIN RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK IC801 PIN 23 CL...

Page 16: ...F CHECK THE VOLTAGE OF CRT CATHODE ABOUT 40Vpp CHECK THE VOLTAGE OF FBT SCREEN ABOUT 400V TO 700V CHECK THE RELATIVE CIRCUIT CHECK THE 12V PIN OF P802 CONNECTOR OF SMPS ON MAIN PCB RELATIVE CIRCUIT EX...

Page 17: ...1 NO RASTER DISCONNECT WITH SIGNAL CABLE NG OK OK OK NG NG NG CHECK THE COLLECTOR VOLTAGE CHECK THE COLLECTOR VOLTAGE RELATIVE CIRCUIT RELATIVE CIRCUIT CHECK Q402 T401 CHECK T401 T402 Q402 Q403 ABOUT...

Page 18: ...CUIT OF Q404 Q405 Q406 CHECK THE RELATIVE CIRCUIT OF SMPS READJUST H WIDTH FUNCTION CHECK THE HV OF CRT ABOUT 24 5KV CHECK FBT B VOLTAGE ABOUT 62V AT FH 31KHz 2 ABNORMAL HORIZONTAL VIDEO CENTER RELATI...

Page 19: ...K THE VOLTAGE OF IC101 RELATIVE CIRCUIT CHECK IC401 PIN 20 21 22 23 CHECK THE IC601 PIN 2 ABOUT 11 8V PIN 4 ABOUT 12V CHECK D601 C605 2 VERTICAL CENTER NG READJUST V CENTER RELATIVE CKT CHECK IC401 AN...

Page 20: ...BNORMALVARIABLE OUTPUT NG OK NG OK OK NG NG OK OK NG OK NG YES NO CHECK BRIDGE RECTIFIED CIRCUIT CHECK START C K T R939 D912 D911 R930 CHECK IC401 CHECK D919 CHECK Q911 Q911 FAILURE CHECK IC901 CHECKA...

Page 21: ...20 7 MECHANICAL OF CABINET FRONT DIS ASSEMBLY...

Page 22: ...A 58162435A MANUAL P N LABEL 1 PCS 40A 581654 3A CARTON LABEL 2 PCS 40A206865414A ID LABEL 1 PCS 41A 765654 6A MANUAL 1 PCS 44A670365411A CARTON 1 PCS 44A6781 1 EPS CUSHION 1 PCS 44A6781 2 EPS CUSHION...

Page 23: ...A 60262252T CFR 6 2K OHM 5 1 6W 1 PCS AMB774B2NT MAIN BOARD B774B 2NT 1 PCS CRB774B2NT CRT BOARD B774B 2NT 1 PCS 11A6033 2 PCB SUPPORT 2 PCS 15A5640 1 A B AL GND LUG 1 PCS 40A 581624 2B CHASSIS LABEL...

Page 24: ...0VAC 1 PCS C962 65A305M4722B2 4700PF 20 400VAC ACF 1 PCS C963 65A305M4722B2 4700PF 20 400VAC ACF 1 PCS CN902 33A3074 1 2P PLUG 1 PCS CN903 33A3803 3 WAFER EH E 1 PCS D901 93A 5255P52T 1N5408 PEC 1 PCS...

Page 25: ...1W 1 PCS R929 61A152M228 64 MOFR 0 22 OHM 5 2W 1 PCS R939 61A212Y75452T 750KOHM 1 2W 1 PCS RY901 77A 260 5 2W RELAY OSA SS 212DM5 1 PCS SG489 62A 10 16 W SPARK GAP 1 PCS SS1 95C2070548 WIRE 1 PCS T401...

Page 26: ...UF 100V 5 1 PCS C415 64A 44J4721AT 4700PF 100V PEI 1 PCS C417 64A178J224 1T C121X 0 22UF 100V 5 1 PCS C421 65A517K102 2T 1000PF 10 Z5P 500V 1 PCS C423 64A178J823 1T CL21X 0 082UF 100V 5 1 PCS C429 64A...

Page 27: ...4 1T C121X 0 1UF 100V 5 1 PCS C922 65A 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C923 65A 1K820 5T6921 CAP C 82P 10 1KV Y5P 1 PCS C934 65A 1K101 5T6921 100PF 1KV Y5P 10 1 PCS C937 67A 309471 3T 470UF 20 16V...

Page 28: ...1002 1W52T 1N5817 1 PCS FB402 71A 55 29 FERRITE BEAD 2 2 3 5 0 1 PCS FB403 71A 55 19 T FERRITE BEAD 9X3 5X0 8 1 PCS FB901 71A 55 19 T FERRITE BEAD 9X3 5X0 8 1 PCS J001 71A 55 29 FERRITE BEAD 2 2 3 5 0...

Page 29: ...T CFR 10K OHM 5 1 6W 1 PCS R129 61A 60247152T CFR 470 OHM 5 1 6W 1 PCS R130 61A 60210352T CFR 10K OHM 5 1 6W 1 PCS R131 61A 60247252T CFR 4 7K OHM 5 1 6W 1 PCS R132 61A 60210152T CFR 100 OHM 5 1 6W 1...

Page 30: ...5L10052T CFR 10 OHM 5 1 2W 1 PCS R447 61A 60210252T CFR 1K OHM 5 1 6W 1 PCS R448 61A 17210252T CFR 1KOHM 5 1 4W 1 PCS R449 61A 17233152T CFR 330OHM 5 1 4W 1 PCS R460 61A 17247252T CFR 4 7K OHM 5 1 4W...

Page 31: ...5 61A 60251252T CFR 5 1K OHM 5 1 6W 1 PCS R906 61A 17210052T CFR 10OHM 5 1 4W 1 PCS R908 61A175L75952T CFR 7 5 OHM 5 1 2W 1 PCS R909 61A 17210152T CFR 100OHM 5 1 4W 1 PCS R910 61A 60291352T CFR 91K OH...

Page 32: ...BRASS 1 PCS RV23 6A 31 4 BRASS 1 PCS RV24 6A 31502 BRASS 1 PCS RV25 6A 31502 BRASS 1 PCS RV26 6A 31502 BRASS 1 PCS RV27 6A 31502 BRASS 1 PCS RV28 6A 31502 BRASS 1 PCS RV29 6A 31502 BRASS 1 PCS RV3 6A...

Page 33: ...T 47UF 20 16V 1 PCS C808 67A 309100 3T 10UF 20 16V 1 PCS C810 67A 309220 3T 22UF 20 16V 1 PCS C813 65A251K104 2T 0 1UF 250V 1 PCS C814 65A 450104 7T 0 1UF 80 20 50V Y5V 1 PCS C815 64A178J104 0T CL21X0...

Page 34: ...0 68UH 10 1 PCS R802 61A 60210152T CFR 100 OHM 5 1 6W 1 PCS R804 61A175L10152T CFR 100 OHM 5 1 2W 1 PCS R805 61A 60210152T CFR 100 OHM 5 1 6W 1 PCS R806 61C 21019252T MFR 1 9KOHM 1 1 6W 1 PCS R807 95A...

Page 35: ...K 1 PCS M1A1730 6128 SCREW M3x6 2 PCS IC802 56C 551525 LM2476 1 PCS 90A6118 1 HEAT SINK 1 PCS M1A1730 6128 SCREW M3x6 1 PCS Q428 57A 600 21 IRF630M S T 1 PCS 15A5659503 REAR BRACKET 1 PCS B1A1140 6128...

Page 36: ...33 10 FUSE CLIP 2 PCS F901 84A 7H400 SL FUSE 4A 250V LF 618 004 1 PCS 87A 501 6 6425 RECEPTACLES 1 PCS CN901 95C 800 2 2 WIRE 1 PCS 90A 360504 HEAT SINK 1 PCS D919 93A306050252T RG4AS 1 PCS DF919 71A...

Page 37: ...Q406 PINCUSHION H SIZE CONTROL Q907 Q908 Q909 Q910 POWER SAVING IC401 TDA9118 VERT HOR OSC IC801 NT6812 PRE AMP Q403 T402 FBT HOR O P Q402 T401 HOR DRIVER IC601 TDA9302H VERT O P EHT G1 G2 FOCUS X RA...

Page 38: ...ING 3 Q907 90 264V IC901 POWER SMOOTHED CONTROL AC INPUT POWER T901 6 3V LINE 12V T402 Q908 SWITCH STR 5643D R930 B IC401 MOSFET FROM IC101 CPU 80V R929 FILTER 5V H SYNC 6 3V ON OFF L906 4 Q912 Q920 3...

Page 39: ...38 10 IC BLOCK DIAGRAM IC401 STV9118 IC101 NT6865...

Page 40: ...39 IC102 24LC08...

Page 41: ...40 IC601 STV9302A IC801 NT6812K...

Page 42: ...41 IC802 LM2476 IC901 STR G5643D...

Page 43: ...42 11 PCB LAYOUT 11 1 MAIN PCB LAYOUT...

Page 44: ...43 11 2 CRT BOARD LAYOUT...

Page 45: ...250V R402 1 2K 1 4W C406 0 1UF C108 22 NPO 72 D863 FR155 C463 0 01 50V 220K 1 4W R478 C409 1000P D929 UF4004 R969 75K 1 4W R941 510 1 4W D939 1N4148 600V errors or ommissions D403 UF4004 P402 1 2 3 4...

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